gemma-antiqua:Ancient Egyptian frog ring, dated to the eighteenth to nineteenth dynasties of the New
gemma-antiqua:Ancient Egyptian frog ring, dated to the eighteenth to nineteenth dynasties of the New Kingdom, or c. 1543-1187 BCE. The ring is made of Egyptian blue, which, according to the source, was a “vibrant blue pigment, considered to be the first synthetically-produced pigment, composed of quartz sand, a copper compound, and calcium carbonate. The colour blue was highly prized in ancient Egypt and the creation of a synthetic pigment allowed artists to produce imitations of the precious stones lapis lazuli and turquoise, which were expensive and not always readily accessible.” Egyptian blue fell out of favor sometime during the Roman period. -- source link
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